Sway has absolutely zero tearing, for this it is very good.
But, a few issues (mostly wayland and not sway related):
· First you need an AMD card, I don't really have a problem with that as their cards are good now. But if your laptop has nvidia, you are screwed.
· Copy paste still fuzzy
· No global hotkey. Well you have to configure them at the WM level, things like discord push to mute will not work.
· Hard to capture (OBS cannot capture wayland app yet without major tinkering and testing)
· Many popup widgets are positioned on the wrong monitor (like fcitx popup for japanese input)
· Complex X apps are slow or will just crash crash, for example qgis is unusable in X mode and crash in wayland mode, audacity do not update properly…
· Some things require tons of tinkering to get right, like having the proper rendering pipeline, for example using mpv, but when you get it right, you can play 4k movies with 3% cpu usage.
· Tray/notification icons are hard to setup and won't work 100%.
Disclaimer: I use sway on a large desktop workstation, so I cannot comment on issues like power, sleep, external monitors…